MATLAB: Multiple cprintf in parallel loop problem

cprintf in parallel

I want to print a secetence with different color in the command windows using 'cprintf':
https://www.mathworks.com/matlabcentral/fileexchange/24093-cprintf-display-formatted-colored-text-in-the-command-window
below are the test code:
    q = parallel.pool.DataQueue;
    afterEach(q, @(args) cprintf(args{:}));
    parfor i=1:1:100
        tic
        pause(0.5)
        time1=toc;
        fprintf(', Reading time:'); send(q,{'Keywords','%4.1f',time1}); fprintf(' seconds,') 
    end
the code runs OK using regular for-loop, but once I changed it into parfor, the printed result are chaos, this may be caused by the combination of fprintf-cprintf-fprintf.
is there anyway to solve this problem?
Thanks!
Yu

Best Answer

To stop the output being interleaved, you need to send all the stuff to be printed as a single message. Here's one way:
    q = parallel.pool.DataQueue;
    afterEach(q, @multiCprintf);
    parfor i=1:1:100
        tic
        pause(0.5)
        time1=toc;
        % Send multiple sets of things to print in a cell-of-cells
        send(q, {...
            {'Reading time: '}, ...
            {'Keywords', '%4.1f', time1}, ...
            {' seconds\n'}});
    end
    function multiCprintf(argsCell)
    % loop over the outer layer of cells, and call cprintf on
    % the inner layers.
    for idx = 1:numel(argsCell)
        theseArgs = argsCell{idx};
        cprintf(theseArgs{:});
    end
    end
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